You didn't fall prey to your instinctual nature. Rather, you retained your consciousness, despite your undead state. In this way, you are able to find alternative food such as you entered bases of apocalypse survivors to feed.

While you were rummaging through the cabinets, suddenly, you heard the sound of a gun being loaded behind you. An instinctual reaction causes you to turn around, only to find a man pointing a gun at your head.

"What do you think you're doing." His eyes narrowed.